Add ANGLE support to Viewer on Windows

Change-Id: I97a844b2f289d2518f60a64f94d60551c4530dd4
Reviewed-on: https://skia-review.googlesource.com/35742
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
13 files changed